A study of thermal effects accompanying exothermic hard rubber reaction with the help of differential thermal analysis has been extended to 68/32 rubber–sulfur compounds containing different metallic oxides and metallic oxide–accelerator combinations. Metallic oxides do not affect the heat of reaction appreciably; however, they affect the slope value, litharge showing an unusually low value. In combination with accelerator, metallic oxides exert specific effects on heat of reaction, initiation temperature, and slope value. Attempts have been made to explain these findings on the basis of the known behavior of the individual oxides and the accelerators.
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